# Copyright 2022 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""abstract base class for boundaries."""
from abc import abstractmethod


class Boundary:
    r"""
    Abstract base class for boundaries.

    Args:
        config (dict): boundary configuration.
    """

    def __init__(self, config):
        self.config = config

    @abstractmethod
    def fill_values_head(self, pri_var, axis, pad_size):
        raise NotImplementedError()

    @abstractmethod
    def fill_values_tail(self, pri_var, axis, pad_size):
        raise NotImplementedError()
